National University Of Kaohsiung Taiwan T.Y.Yeh Professor Department of Civil and Environmental Engineering

Yeh was born in Taiwan, in 1965 Yeh was born in Taiwan, in 1965. He received a Batcher degree in environmental engineering from National Chung Kung University in 1987, received a Master’s degree in Civil and environmental from UC Berkeley in 1992 and a Ph.D. degree in Civil and environmental from Penn State University in 1997. He is a professor in the department of Civil and environmental engineering at National University of Kaohsiung.

What is wastewater treatment Usually refer to sewage treatment, or domestic wastewater treatment process of removing contaminants from wastewater, both runoff and domestic

Where does wastewater come from? Residences (kitchen, bathroom) Commercial institution Industrial institution (usually require specialized treatment process)

Conventional Wastewater Treatment Process Pre-treatment involves: Screening Grit Removal Oil separation Flow equalization Chemical Treatment is used in conjunction with the physical and chemical processes: Chemical precipitation Adsorption Sludge Treatment and Disposal involves: grinding, degritting, blending, thickening, stabilization, conditioning, disinfection, dewatering, heat drying, thermal reduction. Disinfection can use: Chlorine compounds Bromine Chloride Ozone UV Radiation

Biological Treatment In the case of domestic wastewater treatment, the objective of biological treatment is: To stabilize the organic content To remove nutrients such as nitrogen and phosphorus Types: Aerobic Processes Anoxic Processes Anaerobic Processes Combined Aerobic-Anoxic-Anaerobic Processes Pond Processes Attached Growth Suspended Growth Combined Systems Aerobic Maturation Facultative Anaerobic

Major Aerobic Biological Processes Type of Growth Common Name Use Suspended Growth Activated Sludge (AS) Carbonaceous BOD removal (nitrification) Aerated Lagoons Attached Growth Trickling Filters Carbonaceous BOD removal. nitrification Roughing Filters (trickling filters with high hydraulic loading rates) Carbonaceous BOD removal Rotating Biological Contactors Packed-bed reactors Combined Suspended & Attached Growth Activated Biofilter Process Trickling filter-solids contact process Biofilter-AS process Series trickling filter-AS process

Activated Sludge Process The aeration tank contains a suspension of the wastewater and microorganisms, the mixed liquor. The liquor is mixed by aeration devices (supplying also oxygen) A portion of the biological sludge separated from the secondary effluent by sedimentation is recycled to the aeration tank Types of AS Systems: Conventional, Complete-Mix, Sequencing Batch Reactor, Extended Aeration, Deep Tank, Deep Shaft

Rotating Biological Contactors It consists of a series of circular disks of polystyrene or polyvinyl chloride that are submerged in wastewater and rotated slowly through it The disk rotation alternately contacts the biomass with the organic material and then with atmosphere for adsorption of oxygen Excess solids are removed by shearing forces created by the rotation mechanism

Upflow Anaerobic Sludge Blanket Wastewater flows upward through a sludge blanket composed of biological granules that decompose organic matter Some of the generated gas attaches to granules that rise and strike degassing baffles releasing the gas Free gas is collected by special domes The effluent passes into a settling chamber

Technology to be used inside WWTPs proposed by the Government Coarse Screening Fine Screening Grit and Grease Removal Tank Pumping Primary Settling Tank Degassing Tank Pumping Aeration Tank or Biofilter Treated Water Pumping Station Venturi Flume Distribution Structure Secondary Settling Tank

Hydrology: Current Research Related Conferences 5th Biodiversity Conference March 10-12,2016 Madrid, Spain

Hydrology: Current Research Related Journals Journal of Geology & Geosciences Journal of Geophysics & remote Sensing

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